Method of making plowshares



N. C. RENDLEMAN METHOD OF MAKING PLOWSHARES March 12, 1935.

Filed June 20, 1953 2 Sheets-Sheet 1 March 12, 1935. N. c. RENDLEMAN 1,994,287

METHOD OF MAKING PLOWSHARES Filed June 20, 1933 2 Sheets-Sheet 2 LM WMM Patented Mar. 12, I935 r I r V i UNITED- STATES PA ENT OFFICE METHOD OF MAKING PLOWSHARES Norman'C. Rendleman, Pittsburgh, Pa., assignor to Jones & Laughlin Steel Corporation, Pittsburgh, Pa., a corporation of Pennsylvania Application June 20, 1933; Serial No. 676,624

r 10 Claims. (Cl. 229-44) 7 My invention relates to; a plow share or point die rolling operation in the same manner as the and a method of manufacturing such article. string of Figures 1 and 2; i e I I The manufacture of plow shares as carried Figure 7 is a side elevation of the string of on heretofore by weldingthe landside portion Figure 6; V i

onto the blade portion, and trimming and forg-' Figure 8 is a view similar to Figure 4 illus- 5 ing the welded assembly, has been expensive trating the manner f positioning the toe and and wasteful of stock. vBecause of the irregular 'heel blanks adjacent the partial blanks preparashape of the article, th eziscrap loss has often tory to welding them together; i runjas high as 40 percent, Figure 9 is a view similar to Figure 8 showing 10 In accordance with my invention, I avoid the the parts assembled within a jig for welding; 10 high scrap loss characterizing previous methods Figure 10 is a sectional View substantially of manufacturing plowshares. I takeflat bar along the line XX of Figure 9 illustrating stock and subject it todie rolling to form 'cerdiagrammatically the welding of the parts; tain portions of the finished share, specifically Figure 11 is a plan' view of two complete the blade and a part of the landside. The die blanks for shearing and trimming; 15 rolled bar thus constitutes astring .of partial Figure 12 is a similar view of a complete or blade and landside blanks for the manufacblank after shearing and trimming; ture of shares. In the die rolling, raised ribs Figure 13 is an edge view of the blankv after are formed extending transversely of the bar it has been subjected to a preliminary bending and at an angle to the length thereof. 1 suboperation; 7 20 'ject a secondpiece of bar stock to a die rolling Figure 14 is a similar view showing the blank operationin whichsubstantially similar ribs are after it has been subjected to a forging operaformed. The second die rolled bar or string ition; g of blanks is thencut into triangular pieces to- -Figure 15- is a sectional view along the line form the toes and heelsoitheshares. These XVXV of Figure 14; and 25 pieces are flash welded to the blanks formed by V Figure 16 is a perspective view of thefinished the first die rolling operation so that the ribs share showing the shaped blade and heel and of the triangular pieces form: a continuation of an inserted point of hard steel welded in place. the ribs of the partial blanks. The completed Referring now in detail t the drawings, I take blanks are then sheared and subjected to benda piece of flat bar stock 10 of suitable dimen- 30 ingand forging operations to impart thereto sions and subject it to die rolling between rolls the desired final shape. e 11; and 12 to produce a string 13 of partial For a complete understanding of the invenblanks 14, The die roll 11' is suitably grooved tion, reference is made to the accompanying at 15- to form ribs 16 extending transversely of drawings illustrating a preferred practice. In h lank 4 in' pairs at n n l to h l n h 35 the drawings: 7 i l 7 thereof. An open pass is used and the blanks Figure 1 is a planiview of a string of blade a slightly w n as Shown at V and landside blanks formed by die rolling a ShQWn 1n Flgure the llbs are formedlength of bar t 7 in-pairs along the length of the string 13. The 40 Figure 2 is a side elevation of the string shown String may be sheared into pieces by cutting 40 in Figure i tween the pairs of ribs to formsets of two par- Figure 3 is a view largely'diagrammatic illus- -t1a1 b1anks Secured t he reversed trating the'die 'rolling operation which promsedrelatlon as f m Flgures 4 duces the string of blanks shown in Figures h end of each plece Includes blade'fqrmmg e 7 4 v portion 18 and at least a part of a landside 19.

1 j v The ribs 16 are formed at the junctionofjthe Figure 4 IS 'a view similar to Figure 1 showing 1 v v e portions 18 and 19. two blade and landside blanks of equal length By Shearing the String along the dotted lines sheared from the strrngshown in Figures 1 ad in Figure 1, it will be apparent that two cohand 2; l nected partial blanks of substantially the same 50 Figure 5 is a View Similar Figurefi shflwins length of blade will be formed, as shown in Figtwo p a blanks of difierentlensths sheared ure'4, whereas by shearing the string 'al'ongthe from the Sa S dotted lines bb, two connected partial blanks Figure 6 is a V s a t Figure 1 owing having different lengths of blade will be formed, the string of toe and heel blanks formed by a as shown in Figure 5. The grooves 15 in the 55 'Figure 11, are sheared apart along the line 34 extendingsubstantially from the outer vertex of vpearance shown in Figure 12.

roll 11 will be such as to provide also a suitable amount of excess material between adjacent sets of blanks to permit some tolerance in the shearing of the string without introducing an inordinate amount of waste.

In the manner already described for the formation of the partial blanks 14, I die roll flat bar stock to produce a string of toe and heel blanks illustrated at 20. The .toe and heel blanks are characterized by ribs 21 extending thereacross in the same manner as the ribs 16 are positioned on the blanks .14, andby slight spreadings 22 on opposite sides of the ribs 21. I shear the string 20 into blanks along the dotted lines 23 and 24. operation produces a plurality of identical blanks of substantially triangular outline, each blank having a raised rib extending sub-stantially from one vertex of the triangle tothe midpoint of the opposite side. The separate toe and heel blanks are illustrated at 25 in Figure '8 where theyare shown disposed in proper relation to the blanks 14 prior to welding thereto. Each of the blanks 25 has a portion 26 adapted jto'cooperate with'the "portion 19 of the blanks 14=-to form the heelof a finished share. The remaining portion 27 of the blanks 25 cooperates with the blade-forming portion 18 of the blanks 14 to formthetoe of the shares.

When the partial blanks 14 and the toe and heel blanks 25 have been disposed as shown in Figure 8, they'are brought together and placed withina jig, as'shown in Figure 9, comprising movable plates 28 and 29 having upstanding lugs 30 thereon. It will be observed in Figures 8 and 9 that the ribs 21 of the toe and heel blanks are in alinement with the ribs 16- of the blade and landside blanks 14. The jig plates 28 and-29 may be actuated and controlled in any suitable manner to press the blanks 25 toward "the partial blanks 14. While the'partsare in such relation, I supply electric current to the joints between the toe and heel blanks and the partial blanks to eifect welding thereof, preferablyby some such means as shown in Figure ;10, comprising a pair of welding electrodes 31, each electrode having an insulated portion adaptedto contact with and supply current to the associated blanks on opposite sides of the joint therebetween. The passage of electric current across the joints between blanks heats the edge portion of the lat- .ter in-the known manner; andsirnultaneous operation of the jig plates 28 and 29 willforce the heated edges together to efiect a satisfactory weld. In the welding operation, the overfilled portions 1'7 and 22 ofthe blanks provide the necessary excess metal which is forced out ,of the welded seam as flash. This may beremovedin any convenient manner. The result of the welding operation, as shown in Figure 11, is a pair of complete share blanks 32 and 33. The two blanks of each pair are obviously arranged in opposed, reversed relation.

When the completed pair of blanks, shown in one of the blanks 25 to a similar point of the other toe and heel blank, two identical share blanks are formed which, after a suitable trimlmingoperation along the lines 35, have the app The completed blank has ablade 36 which is substantially identicalwith theblade-forming portion 18 of the partial blank 14. The completed blank also has It will be apparent that this a landside '37 formed by the portion 19 of the.

blank 14. The portion 26 of theblank 25 forms the heel of the landside. The toe 38 of the completed blank is formed by the remainder of the,

blank 25 which is left after the removal of the heel-forming portion 26 thereof.

blank, shown in Figure 12, aredisposedsub'stantially in the same plane. The finished blank must, obviously, be subjected to certain forming into proper. relation.

Figure 13 illustrates the condition of the blank after the landside3'7 has been bentsubstantially at right anglesto'the blade 36. When the land- The blade 36, the landside 3'7 and the toe 38 of thefinished operations to bring the several portions thereof sideeandblade havezthus been bent, the blank is sublficted to ,arforging operation which imparts a'slight curvature to the blade 36, bends .the landside 3E7 slightly beyond its'initial right angu lar position, and brings the other parts ,of the Figure 14. A hard steel piece 40 is-welded onto 20 article into the shape and relation shown in the toe. "The share is then ready for such 'machining operations asare necessary-to adapt it for assembly with the reniainirigpartsof a plow. It will'be apparent from the-foregoing description that the invention provides a highly efficient method-of making plowshares or points. ilThe amount of scrap producedin'the practice,of-' the method isobviously quite small and,the varius partsmaking up the-completed share may readily, be produced very cheaply and-rapidly-by die rolling which is already well knownfi- The cost of shares made in accordance with myinventionwill obviously be much less than those'pr'oduced, by the oldforging process, not only because-of the reduction in the amount ofscrap but-also because of the rapid'rate and-low-costat which the necessary components of the finished share may be turned out.

Although I have illustrated and-ydescribed.

hereinbut onepreferred practice of ethe invention, it'will be apparent-that numerous changes of a pair of completed shares jjand a pairof' parallel ribs on one surfaceextending at-an making plow shares, the

angle tothe length of the string, "constituting the junctions of said portions, die rollinga' second leader to form a string of toe and heel blanks, said string having. uniformly spaced parallel ribs extendingat an:angle:to.the length of the string, shearing the zsecond-sstr'ing .into' similar triangular toe iandiheeleblanks, the ribs' of each extending substantially from one wertcx' to the midpoint of the Qppositefside, weldingthe toe and heel blanks to opposite sides of thepartial blanks with the .ribs of the former indine with the ribs of the latter, shearing the partial blanks substantially ,along a Jine c nnecti'ng' Qth'e ,outer ends of theribs. of the, ppintnblanksl to form two complete share blanksftrimrn ing each complete blank, bending the landside portion j ,each blank at an angle to the .blade portiong and forging theblanks. I 1

2. In a method of making plow shares, the including die rolling a leader to: form a string 10f art lb n s l bavin 'n rt n afi t to constitutethe blades andp'ortion's of the' landsides of a pair of completed shares, and a pair of parallel ribs on one surface extending at an angle to the length of the string, die rolling a second leader to form a string of toe and heel blanks having uniformly spaced parallel ribs extending at an angle to the length of the string,

shearing the second string into similar triangua lar toe and heel blanks, welding the toe and heel blanks to opposite sides of the :partial blanks with the ribs of the former in line with the ribs of the latter to form a pair of complete blanks, shearing the welded blanks to form two complete share blanks, bending the landside portion of each blank at an angle to the blade portion and forging the blanks.

3. In a method of making plow shares, the steps including die rolling a leader to form a string of partial blanks, each having portions adapted to constitute the blades and portions of landsides of a pair of completed shares, shearing the partial blanks from the string, die rolling a second leader to form a string of toe and heel blanks, shearing the second string into similar triangular point blanks, welding the toe and heel blanks to opposite sides of the partial blanks, shearing the welded blanks to form two complete share blanks, and forging the blanks to shape.

4. In a method of making plow shares, the steps including die rolling a leader to form a string of pairs of blanks, each blank having portions adapted to constitute the blade and a portion of the landside of a share, shearing the pairs from the string, die rolling a second leader to form a string of toe and heel blanks, shearing the second string to form individual toe and heel blanks, welding the toe and heel blanks to opposite sides of the pairs of blanks, shearing the pairs of blanks to form two complete share blanks from each and forging the blanks to shape.

5. In a method of making plow shares, the steps including die rolling a bar to form a string of partial share blanks each having blade and landside-forming portions, shearing pairs .of blanks from the string, die rolling a second bar to form a string of toe and heel blanks, shearing the toe and heel blanks apart and welding them to opposite sides of the pairs of blanks from the first-mentioned string to form complete share blanks, shearing the pairs of blanks apart and forging the'blanks to shape.

6. 'In a method of making plow shares having a toe, a blade and a landside with a heel, the steps including die rolling a leader to form blanks having portions adapted to constitute the blade and a part of a landside of a finished share, die rolling a second leader to form blanks adapted to constitute the toe and heel of a finished share, shearing the toe and heel blanks apart and welding them on the first-mentioned blanks, shearing the first-mentioned blanks apart, and forging the completed blanks to shape.

7. In a method of making plow shares having a toe, blade, and landside, the steps of die rolling bar stock to form blanks, including in an integral piece certain of said portions, shearing the blanks into combinations of two each, die rolling a second piece of bar stock to form blanks containing other parts of said portions, shearing the last-mentioned blanks apart and welding them to opposite sides of said combinations, to form pairs of complete blanks, shearing the pairs of blanks apart and forging the blanks so formed.

8. The method of claim 6 characterized by shearing the first-mentioned blanks into pairs before welding the toe and heel blanks thereto, and finally shearing the pairs of complete blanks on a line through the first-mentioned blanks and the toe and heel blanks welded thereto.

9. The method of claim 6 characterized by shearing the blade blanks into pairs and welding a toe and heel blank onto both sides of the pair of blade blanks.

10. The. method of claim 6 characterized by shearing the blade blanks into pairs and welding a toe and heel blank onto both sides of the pair of blade blanks, and separating the blanks'of each pair so as to leave a portion of both toe and. heel blanks.

NORMAN C. RENDLEMAN. 

